Fabricating process setting

Most of the operations are such that the fabricating process can be set indoors. Extremely large parts, or those requiring great quantities of eicpls, are processed out-of-doors to prevent residual and reflected shock or blast fronts from damaging the buildings (Ref 7, p 3)... 

Second, by actually monitoring the state of the material, it is possible to control the fabrication process by data rather than a procedure, such as a set time temperature sequence. This means one can have a self-correcting, automated, intelligent cure process that can adapt to variations in material age, fabric permeability, tool heat transfer characteristics, and the like. 

This short-term pilot-scale evaluation was accomplished by testing various filtration units under the same set of process conditions. Not only did this work result in a final equipment specification, but revealed significant wafer fabrication process changes. The conclusions of this process design project are listed below ... 

Commercial success of sulfur-iodine hydrogen production depends largely on the capacity to identify materials of construction that can handle the corrosive environments and on the ability to manufacture process components with these materials economically. This chapter has reviewed a cross-section of materials data generated by testing in the various process settings within the cycle. Ta alloys and SiC have been shown to have good corrosion characteristics in all the liquid environments, but individual candidates have also been suggested for use in particular conditions. Both of these materials have unique mechanical properties, and much effort is needed in order to use them for component fabrication. 

Hulteen, J.C. and Van Duyne, P. (1995) Nanosphere lithography A materials general fabrication process for periodic particle array surfaces. J. Vac. Set. Technol. 13 1553-58. 

Synthetic fibers are generally thermoplastic, and the careful use of heat—either wet or dry—has been used to set the twist or weave in fabrics. Heat setting for nylon, although it is not a chemical process, is necessary to prevent unwanted wrinkles or other distortions from appearing in subsequent processing and use. Glass fiber fabrics are subjected to the coronizing process where the fabric is heated to about 1100° F. 

The recognition of such interrelationships between properties has two benefits. Firstly, it can significantly reduce the number of independent variables which have to be considered, and thus the amount of effort required, for the design and development of a new polymer or a new fabrication process. Secondly, it can provide a more realistic set of expectations concerning the maximum attainable performance and the tradeoffs which often have to be made between mutually conflicting "ideal" performance requirements. 

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